<template>
  <div id="aCoursesList" class="bg-fa of">
    <!-- /课程列表 开始 -->
    <section class="container">
      <header class="comm-title">
        <h2 class="fl tac">
          <span class="c-333">全部课程</span>
        </h2>
      </header>
      <section class="c-sort-box">
        <section class="c-s-dl">
          <dl>
            <dt>
              <span class="c-999 fsize14">课程类别</span>
            </dt>
            <dd class="c-s-dl-li">
              <ul class="clearfix">
                <li>
                  <a title="全部" href="#" @click="getCourseFrontList()" :class="{'bg-orange': firstSubject == -1}">全部</a>
                </li>
                <li v-for="(subject,index) in firstSubjectList" :key="subject.id" :class="{'bg-orange':firstSubject == index}">
                  <a :title="subject.title" href="#" @click="selectFirst(subject.id, index)">{{subject.title}}</a>
                </li>

              </ul>
            </dd>
          </dl>
          <dl>
            <dt>
              <span class="c-999 fsize14"></span>
            </dt>
            <dd class="c-s-dl-li">
              <ul class="clearfix">
                <li v-for="(subject,index) in secondSubjectList" :key="subject.id" :class="{'bg-orange':secondSubject == index}">
                  <a :title="subject.title" href="#" @click="selectSecond(subject.id, index)">{{subject.title}}</a>
                </li>
              </ul>
            </dd>
          </dl>
          <div class="clear"></div>
        </section>
        <div class="js-wrap">
          <section class="fr">
            <span class="c-ccc">
              <i class="c-master f-fM">1</i>/
              <i class="c-666 f-fM">1</i>
            </span>
          </section>
          <section class="fl">
            <ol class="js-tap clearfix">
              <li :class="{'current bg-orange':buyCountSort!=''}">
                <a title="销量" href="javascript:void(0);" @click="searchBuyCount()">销量
                  <span :class="{hide:buyCountSort==''}">↓</span>
                </a>
              </li>
              <li :class="{'current bg-orange':gmtCreateSort!=''}">
                <a title="最新" href="javascript:void(0);" @click="searchGmtCreate()">最新
                  <span :class="{hide:gmtCreateSort==''}">↓</span>
                </a>
              </li>
              <li :class="{'current bg-orange':priceSort!=''}">
                <a title="价格" href="javascript:void(0);" @click="searchPrice()">价格&nbsp;
                  <span :class="{hide:priceSort==''}">↓</span>
                </a>
              </li>
            </ol>
          </section>
        </div>
        <div class="mt40">
          <!-- /无数据提示 开始-->
          <section class="no-data-wrap" v-if="courseList.total === 0">
            <em class="icon30 no-data-ico">&nbsp;</em>
            <span class="c-666 fsize14 ml10 vam">没有相关数据，小编正在努力整理中...</span>
          </section>
          <!-- /无数据提示 结束-->
          <article v-if="courseList.total > 0" class="comm-course-list">
            <ul class="of" id="bna">
              <li v-for="course in courseList.items" :key="course.id">
                <div class="cc-l-wrap">
                  <section class="course-img">
                    <img :src="course.cover" class="img-responsive" :alt="course.title">
                    <div class="cc-mask">
                      <a :href="'/course/' + course.id" title="开始学习" class="comm-btn c-btn-1">开始学习</a>
                    </div>
                  </section>
                  <h3 class="hLh30 txtOf mt10">
                    <a :href="'/course/' + course.id" :title="course.id" class="course-title fsize18 c-333">{{course.title}}</a>
                  </h3>
                  <section class="mt10 hLh20 of">
                    <label class="fr jgTag bg-green" v-if="Number(course.price) === 0">
                      <i class="c-fff fsize12 f-fA">免费</i>
                    </label>
                    <label class="fr jgTag bg-orange" v-if="Number(course.price) > 0">
                      <i class="c-fff fsize12 f-fA">{{course.price}}</i>
                    </label>
                    <span class="fl jgAttr c-ccc f-fA">
                      <i class="c-999 f-fA">{{course.buyCount}}人学习</i>
                      |
                      <i class="c-999 f-fA">9634评论</i>
                    </span>
                  </section>
                </div>
              </li>
            </ul>
            <div class="clear"></div>
          </article>
        </div>
        <!-- 公共分页 开始 -->
        <div>
          <div class="paging">
            <!-- undisable这个class是否存在，取决于数据属性hasPrevious -->
            <a :class="{undisable: !courseList.hasPrevious}" href="#" title="首页" @click.prevent="gotoPage(1)">首</a>
            <a :class="{undisable: !courseList.hasPrevious}" href="#" title="前一页" @click.prevent="courseList.hasPrevious && gotoPage(courseList.current-1)">&lt;</a>
            <a v-for="page in courseList.pages" :key="page" :class="{current: courseList.current == page, undisable: courseList.current == page}"
              :title="'第'+page+'页'" href="#" @click.prevent="gotoPage(page)">{{ page }}</a>
            <a :class="{undisable: !courseList.hasNext}" href="#" title="后一页" @click.prevent="courseList.hasNext && gotoPage(courseList.current+1)">&gt;</a>
            <a :class="{undisable: !courseList.hasNext}" href="#" title="末页" @click.prevent="gotoPage(courseList.pages)">末</a>
            <div class="clear" />
          </div>
        </div>
        <!-- 公共分页 结束 -->
      </section>
    </section>
    <!-- /课程列表 结束 -->
  </div>
</template>
<script>
  import courseService from '@/api/course.js'

  export default {
    data() {
      return {
        page: 1,
        courseList: {},
        firstSubjectList: [],
        secondSubjectList: [],
        firstSubject: -1, // 用来表示当前选择的一级分类
        secondSubject: -1, // 用来表示当前选择的二级分类
        courseFrontVo: {}, // 查询的表单对象
        buyCountSort: '', // 排序
        gmtCreateSort: '',
        priceSort: ''
      }
    },
    created() {
      this.getCourseFrontList()
      this.getAllSubject()
    },
    methods: {
      getCourseFrontList() {
        this.courseFrontVo = {}
        this.firstSubject = -1
        this.secondSubject = -1
        this.secondSubjectList = []
        courseService.getCourseFrontList(1, 8, this.courseFrontVo).then(response => {
          // console.log(response.data.data.list)
          this.courseList = response.data.data.list
        })
      },
      // 查询所有分类
      getAllSubject() {
        courseService.getAllSubject().then(response => {
          this.firstSubjectList = response.data.data.list
        })
      },
      // 分页切换
      gotoPage(page) {
        courseService.getCourseFrontList(page, 8, this.courseFrontVo).then(response => {
          this.courseList = response.data.data.list
        })
      },
      // 根据一级分类查询二级分类
      selectFirst(subjectParentId, index) {
        // 显示选择的一级分类
        this.firstSubject = index

        // 重置二级分类
        this.courseFrontVo.subjectId = ''
        this.secondSubject = -1
        this.secondSubjectList = []

        // 根据点击的一级分类，遍历 分类列表 获取一级分类下的二级分类
        for (let i = 0; i < this.firstSubjectList.length; i++) {
          var first = this.firstSubjectList[i]
          if (subjectParentId == first.id) {
            this.secondSubjectList = first.children
          }
        }

        // 根据一级分类查询课程
        this.courseFrontVo.subjectParentId = subjectParentId
        this.gotoPage(1)
      },
      // 选择二级分类
      selectSecond(secondSubjectId, index) {
        // 显示点击的二级分类
        this.secondSubject = index
        // 查询该二级分类下的课程
        this.courseFrontVo.subjectId = secondSubjectId
        this.gotoPage(1)
      },
      // 排序
      searchBuyCount() {
        this.buyCountSort = "1"
        this.gmtCreateSort = ""
        this.priceSort = ""
        this.courseFrontVo.buyCountSort = this.buyCountSort
        this.courseFrontVo.gmtCreateSort = this.gmtCreateSort
        this.courseFrontVo.priceSort = this.priceSort
        this.gotoPage(this.page)
      },
      searchGmtCreate() {
        this.buyCountSort = ""
        this.gmtCreateSort = "1"
        this.priceSort = ""
        this.courseFrontVo.buyCountSort = this.buyCountSort
        this.courseFrontVo.gmtCreateSort = this.gmtCreateSort
        this.courseFrontVo.priceSort = this.priceSort
        this.gotoPage(this.page)
      },
      searchPrice() {
        this.buyCountSort = ""
        this.gmtCreateSort = ""
        this.priceSort = "1"
        this.courseFrontVo.buyCountSort = this.buyCountSort
        this.courseFrontVo.gmtCreateSort = this.gmtCreateSort
        this.courseFrontVo.priceSort = this.priceSort
        this.gotoPage(this.page)
      },
    }
  }
</script>
<style scoped>
  .active {
    background: #2c8162;
  }

  .hide {
    display: none;
  }

  .show {
    display: block;
  }
</style>
